Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-09-02
THIS PAPER IS SUPERSEDED BY Phys. Rev. D, 76, 083012 (2007)
Astronomy and Astrophysics
Astrophysics
22 pages, 4 figures
Scientific paper
Excess microwave emission observed in the inner Galaxy (inner ~1 kpc) is consistent with synchrotron emission from highly relativistic electron-positron pairs produced by dark matter particle annihilation. More conventional sources for this emission, such as free-free (thermal bremsstrahlung), thermal dust, spinning dust, and the softer Galactic synchrotron traced by low-frequency surveys, have been ruled out. The total power observed in the range 23 < nu < 61 GHz is between 10^{36} and 5x10^{36} erg/s, depending on the method of extrapolation to the Galactic center, where bright foreground emission obscures the signal. The inferred electron energy distribution is diffusion hardened, and is in qualitative agreement with the energy distribution required to explain the gamma ray excess in the inner Galaxy at 1-30 GeV as inverse-Compton scattered starlight. We investigate the possibility that this population of electrons is produced by dark matter annihilation of 100 GeV particles, with cross section
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